Standalone Popup not Working

I tried to ran the example given at the following link, but it is not working for me. See attached demo. Please advise.

docs.dhtmlx.com/popup__initializ … standalone
popup_demo.zip (346 KB)

Hello
You missed doOnLoad() function
Place the next in the beginning:

var myPop; function doOnLoad(){ myPop = new dhtmlXPopup(); myPop.attachHTML("You can enter some text here"); }